smc256bfd6e STMicroelectronics, smc256bfd6e Datasheet - Page 39

• Manufacturer Part Number: smc256bfd6e
• Description: 32mbyte, 64mbyte, 128mbyte, 256mbyte, 512mbyte, 1gbyte, 2gbyte, And 4gbyte 3.3/5v Supply Compactflash Card
• Manufacturer: STMicroelectronics

SMCxxxBF
6.6
I/O Transfer Function
The I/O transfer to or from the Card can be either 8 or 16 bits. When a 16 bit accessible
port is addressed, the
When a 16 bit transfer is attempted, and the
generate a pair of 8 bit references to access the Word’s even and odd Bytes. The Card
permits both 8 and 16 bit accesses to all of its I/O addresses, so
addresses (see
Table 33.
Word Output Access
High Byte Input Only
.
Byte Output Access
Word Input Access
Byte Input Access
High Byte Output
Function Code
I/O Read Inhibit
I/O Write Inhibit
Standby Mode
(16 bits)
(16 bits)
(8 bits)
(8 bits)
(8 bits)
(8 bits)
Only
I/O Function
Table
–REG –CE2
33).
–
X
H
H
L
L
L
L
L
L
L
L
IOIS16 signal is asserted by the Card, otherwise it is de-asserted.
H
H
H
H
H
X
L
L
X
L
L
–CE1 A0 –IORD
H
H
H
X
X
L
L
L
L
L
L
H
H
X
X
X
X
X
–
L
L
L
L
IOIS16 signal is not asserted, the system must
H
H
H
H
H
X
L
L
L
L
L
–IOWR
H
H
H
H
H
X
L
L
L
L
L
–
Don’t Care
Don’t Care
Don’t Care
D15 to D8
IOIS16 is asserted for all
Odd Byte
Odd Byte
Odd Byte
Odd Byte
High Z
High Z
High Z
High Z
Card Configuration
Don’t Care
Don’t Care
Even Byte
Even Byte
Even Byte
Even Byte
Odd Byte
Odd Byte
D7 to D0
High Z
High Z
High Z
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